Driving mechanism for wheel lathes



I, K. CULLEN.

DRIVING MECHANISM FOR WHEEL LATHES.

APPLlcATloN FILED JULY 22, i920.

1 g. Patented Aug. 8, 1922,

2 sursis-SHEET l.

K. CULLEN SHIVING MECHANISMFOR WHEEL LATHES.

APPLICAUON FILED JULY 23.1920.

15,424,75@ v Patented Aug. 8, 1922.

\ ai. figg' lllllllllllllllllli l Suva/nto@ E i um v-n Lin* 5 /y// f l mm ram `l Eiga 33 narran stares' PATENT @FFME 'JAMES K. GUL'EN, OF NEW' YORK, N. Y., ASSIGNOR TO NILES-BEMENT-POND COMPANY, OF NEW YORK, N. Y., A. CORPORATION F NEW' JERSEY.

DRIVING MECHANISMQFOR WHEEL LATHES.

Application med July 23,

To all whom t may concern:

Be it knownthat l, JAMES K. GULDEN, a citizen of the United States, residing 'at New York, in the county of New York and State of New York, have invented certain new and useful improvements in Driving Mechanism for Wheel Lathes, of which the following is a specification.

This invention relates to metal turning machines and particularly to -a driving -mechanism for Wheel lathes. In present machines used for this purpose the work drivers rately adjust the are moved into engagement with the work by means of screws operated by hand. In such constructions' it is impossible to accuscrews with the same preswork, and the operation of the screws with` the attendant varying pressures tends'to a distortionvof the wheel, particularly during the turning operation. The present invention 4has for its principal object to provide a mechanism wherein the sure 4against the work'drivers are all moved simultaneously into engagement with the work and with lan equal pressure-against the work, thus avoid.

ing any tendency to distort the work. n-

other object of the invention is the provision -being such that any of' Iwedgemeans for operating the work drivers, such means preferably being operated by fluid pressure andthe construction backl slipping of the operation will securely into engagement with the work.' Other ob. jects of the invention will becomeapparent work during the boring( as the description proceeds.

Referring to .thel figures of the drawings:

Figure 1 is a fragmentary front elevation i of'a wheel/lathe illustrating the present invention applied thereto.

Fig. 2` is a' longitudinal section throughone of-thework spindles and face plates taken on the lineQ-/Q of Fi 3. Fig. 3 is a fragmentary evation of the face plate.` l

Fig. 4: is a cross section through the spindle taken lon the line 4 4 of Fig. 2.

I faceplate shown in Fig-, 5 is a longitudinal section taken on the line 5-5 of Fig. 6,'similar to Fig. 2 but showing a modified construction.

Fig. 6 is a fragmentary elevation of the Fig. 5.

Fig. 7 is a sectional view 'through one of the f work-engaging jawstakenon lthe line Specification of Letters Patent.

[longitudinally within its Patented Aug. 8, 1922.

1920. Serial No. 398,472.

Fig. 11 is a longitudinal section taken on the line 11-11 of Fig. 12 through the spindle and face plate showing a modified .form of the invention. Fig.- 12 is a fragmentary elevation of the face plate shown in Fig. 11.

In accord-ance with the present invention, l mount a plurality of work-driving elements on eac face plate of the machine and operate each set of drivers by a common power means. yAs illustrated, each driver is operatively connected to the piston of a fluid pressure operating means, the driver and its operating means, -including a cylinder and piston, being secured to the face plate of the machine. ln the preferred form of the invention the driving elements are forced to the operating or driving position by means of fluid pressure and the movement in the unclamping directionl is accomplished either by fluid pressure or spring means. However, in certain types of machines it may be desirable to perform both operations by fluid pressure or the clamping operation by spring means and the unclamping operation by fluid pressure means, as illustratedI inl Fig; 10. It will, however, be understood that the disclosure in the drawings is illustrative of the invention and that such modifications as come within the scope of the appended claims may be made without departing from the spirit of the invention.

Referring tothe drawings by reference characters, 1 designates the base and 2 the headstocks of a turning of work spindles 3 'and face plates 4 mounted thereon. The work W, comprising a air of car wheels and axle, is shown in dotand-dash lines in Fig. las mounted between the face plates. The work is engaged by a center 5 extending from each spindle and face plate, 4a screw' provided with an operating wheel 7 serving to move the center spindle. A pair of tool holders 8- are controlled by a shaft 9. The face plates-may be rotated from the step'pulley 10 and the usu-al shaft connecting the two face plates. Since the invenf.

lathe having a pair tion herein lies drivers and the1r not in the machine as -a`whole, further description of the latter is/unnecessary.

The work-engagingA and drivingmeans herein comprises a plurality of devices 11 mounted on each face plate. Each of these devices comprises a base 12 supporting al work jaw holder 13 and acylinder 14 thereon. Two relatively transverse openings 15 and 16 are. formed in Y' each jaw holder and support therein a serrated clamping jaw 17 and a jaw-operating wedge 18 respectively. The wedge is ope-raconnected to the piston 19` operating withln the cylinder 14, this connection pref-- l jaw and the whereby the j erably beingloose, as illustrated at 20, whereby a hammer blow may be had to loosen the wedge. The wedge has a longitudinal sliding movement relative to the jaw has a longitudinal sliding movement relative to the wedge, anobin order to prevent such sliding movement of either of these elements from having any ef# feet upon the other element, I placea block.

21 between such elements. Eachj aw is preferably provided with a spring and pin means 22 adapted to normally keep each jaw at thelowest position on the wedge. During the operation of drivjng the work the driving pressure tends to slide 'the jaw up the' incline of the block ,21 against the spring 22 aw is moved towardand into tighter engagement with the work. As illustrated in Fig. 8, the jaw'is operated in the clamping direction by fiuid pressure and in the unclamping directionby` a spring23,l while in F ig. 10 is illustrated a mechanism operated in the clamping direction by a spring andin the unclamping direction byn fluid pressure.

Referring particularly to the construction shown in Flgs. 2 to 4, it will be seen that four driving devices 11l are mounted on the face the T-slots 24a.

plate 4 by means of bolts 2li/engaging in In this form of driving mechanism the fluid pressure serves to hold the work-engaging jaws in working position and therefore thel fluid pressure must pistons-during the' rotation of the face plate. To convey the fluid pressure to the cylinders during the vrotation of the spindle and face rhplate I mount a member 25 loosely on the spindle and provide packing glands 26 at opposite sides thereof, this structure preferably being made in halves vand'secured together by the bolts 27, as illustrated in F ig. 4. The bore of the member 25 -is provided withl a circumferential port. or conduit28 therein communicating with a port or spindle wall, the port' 28 also being in com munication with the fluid supply pipe 30. The port 29 and port 31 through the face plate ,connect with a circular pipe 32 Surfluld pressure conduitg29 in the rounding theface plate center and branch flexible pipes 33 connect the circular pipe to the cylinders. g

It will be understood that the inea/ns for conveying the fluid pressure to the cylinders J may be widely varied and in Figs. 5 and 6 I have illustrated a 'structure slightly dif-4v ferent from that shown in Figs. 2 .to 4. In this construction I provide ports 34 and 35 through the spindle wall and face plate directly connecting the circular port 28 lin the member 25 with each flexible pipe 33 to its cylinder. 4 In Figs, 10, 11 and 12 is illustrated a mod'- ified'form of the invention wherein fluid pressureis on the clamping mechanism only for the 'purpose of releasin and holding the jaws in released position', t e spring 23a nor- -mally serving to vhold the wedges 18 in the work-securingposition. This construction is otherwise similar tothat illustrated in Figs. 2 and 3 except'that the member 25' on the spindle is eliminated. .When it is desired to `release the clam ing jiaws from work-engaging positiomt e plug 36 is removed from the port 29-in the spindle wall and the air or fluid hose 37 screwed therein. As shown in F ig.\10, in this construction the fluid con nection is 'to the-front of the cylinders and the fluid'pressureat the front side of the piston therein withdraws the wedge from its jaw-clamping position. In 'operation the hose 37 is disconnected and the springs 23 hold the wedges in the work-securing position during the operation of the machine. mat I claim is.: 1. Ina metal working machine, the combination of a rotary work holder, a plurality of driving elements mounted thereon, a' wedge movable relative to each driving element for forcing the elements against the". work, a separate ower means` for operating each wedge, andp means for rotating the holder.A

2. In a metalworking machine, the combi- 110 I nation rofa rotary work holder, a plurality of driving elements mounted thereon, means movable rela-tive to each driving element for forcing the elements against the work, a fluid pressure device for operating each of'115 therst-named means, and means forrotat? ing'the holder. K. v g 3..,Ina metal workin machine, the, combination of a rotary wor holder, a plurality of driving4 elements mounted thereon, a 3,20 wedge movable relative to'each drivingV ele-y mentV for forcing the e ements against the work, a ,fluid pressure device for operating each wedge, and means.- for rotating'the holder. 'f f, f .4.- Ina metaliworkin machine', the combination of,a rotary wor '-ho1der,.a plurality' of drivingelements mounted thereon, a seplarate means-movable relative to .each ldriv.- ing element f0.1' 'forcing the elements against 130 inV operated in `through the spindle and the work, a uid pressure device comprising g a cylinder 'and a resiliently operated piston -therein for operating each of the said means,

, ment for forcing the elements against the work, a fluid pressure device comprising a cylinder and a resiliently operated piston therein for operating each wedge, and means for rotating the holder. l

`6. In a metal working machine, the combination of a rotary workholder, ay plurality of driving elements mounted' thereon, a wedge'movable relative to each driving element for forcing the elements against the work, power means for operating each wedge comprising a cylinder having a piston thereln operated 1n one direction by\a spring and in the oppositedirection by fluid pressure, and means for rotating'the holder.

'7. In a metal working machine, the combination of a .rotary workholder, a .plurality of driving elements mounted thereon, a wedge movable relative to each driving element for forcing the elements against the work, power meansfor operating each wedge comprlsing a cylinder ,having a piston therethe clamping direction by fluid pressure and inthe unclamping direction by a spring, and means for rotating the holder. j

8. In a metal working machine, the combination of a rotary work holder, a plurality of driving'elrements mounted thereon, fluid pressure operated means for operating the drivingjelements simultaneously and with equal pressure, the driving elements and said operating means therefor being of such construction that any slipping of the work due to the reaction of the tool thereon and relative to the said means will automatically tighten the driving elements directly against the work, and means for rotating the holder.

9. 4In a metal working machine, the combination ofa rotary spindle and a work holder mounted. on one end thereof, aI driv-` ing device mounted on comprisingv a work-engaging element, means movable relative theretofor forcing the element against the work and a cylinder having a resiliently operated piston therein for operating the first means, a lconduit extending communicating with the cylinder, and means 'for rotating the holder. y

1 0. In a metal working machine, the combination of a rotary spindle and a. work holder mounted on one end thereof, a plurality of driving elements mounted on the work holder, means movable relative to each driving element for forcing the elements against theA work, power means comprising va work supporting center therein,

the work holder and f a cylinder having a resiliently operated piston'therein 'for operating each of the first means, means comprising a conduit extending through the spindle and. into communication with the cylinders for roviding fluid pressure thereto, and means holder.

11. In a metal working machine, bination of a hollow rotatable spindle, a work holder mounted on one end thereof and a work supporting center therein, a plurality of driving elements mounted on the work holder, means movable relative to each driving element for forcing the elements against the work, power means comprising a cylinor rotating the the comder having a resiliently operated pistontherein for operating the irst means, conduit means extending throughl the spindle wall and into communication with the cylinders for providing fluid pressure thereto, and means 'for rotating the holder.

12. In a metal working machine, the combination of a hollow` rotatable spindle, a

workholder mounted on one end thereof and a plurality of driving elements mounted on the work holder, means movable relative to each driving element for forcing the elements against the work, power means for operating the first means comprising a cylinder having a resiliently operated piston therein, a conduit extending through the spindle wall and communicating with the cylinders "for providing fluid pressurethereto, and means for rotating the holder.

v 13. In a metal working machine, the comlbination of a hollow rotatable spindle, a

work holder mounted on one end thereof and a`work supporting center therein, aplurality thA of driving elements mounted on the work holder, a wedge movable relative to each driving element for forcing the elements against the work, power means comprising a cylinder having a resiliently operated piston f therein for operating each wedge, conduit means extending through the spindle wall and into communicationl with the cylinders for providing fluid pressure thereto, and means for rotating the holder. l

14. In a metal working machine,the combination of a hollow rotatable spindle, a work holder mounted on one end thereof and a work supporting center therein, a plurality of driving elements mounted on the work holder, a wedge movable relative to each driving element for forcing the elements against the work, power means for operating each wedge comprisin a cylinder having a piston. therein operate in one 'direction by. a spring and in the opposite direction by fluid pressure, means comprising a conduit extending through the spindle wall and into .communication with the cylinders .for providing fluid pressure thereto, and means for rotating the holder.

f driving element for forcing the elements 15. In a metal working machine, the combination of a hollow rotatable spindle, a

work holder mounted onl one end thereof' and a work supporting center therein, a plurality of drivingelements mounted on the work holder, a 'wedge movable relative to each driving element for forcing the elements against the work, power means for operating each wedge comprising a cylinder having a piston therein operated in the clamping direction by fluid pressure and in the unclamping directionby a spring, means comprising a conduit extending through the spindle wall and into communication with the cylinders for providing' fluid pressure thereto, and means for rotating the holder.

16. In a metal working machine, the combination of a hollow rotatable spindle, a Work Vholder mounted on one end thereof and a work supporting center therein, a plurality of driving elements mounted on the work holder, means movable relative to each wedge,

] holder.

driving element for forcing ,the 4elements against the work, power means comprising a cylinder having a resiliently operated piston therein for through the spindle wall and into communication with the cylinders for providing fluid pressure thereto, a two piece member loosely mounted on\ the spindleand having a port therein in communication with the spindle conduit and the fluid supply pipe, and means for rotating the holder.

17. In a metal working machine, the combination of a rotary work holder, a plurality of driving elements =mounted thereon, a Wedge movable relative to each driving ele- -mnt for forcing the elements against the work, power means for operating each the power means having a lost motion connection with veach Wedge whereby to secure a hammer blow to release the wedge, and means for rotating the holder.

18. In a metal working machine, the combination of a rotary work holder, a plurality of drivingy elements mounted thereon, ay

wedge movable relative to each driving element for forcing the elements against the work, power meansA comprising a cylinder having a resiliently operated piston therein for operating each wedge, the piston havingv a lost motion connection with each wedge whereby to secure a hammer blow to release the wedge, and means for rotating the 19. In a metal working mach ine',the com.-

bination of a rotary work holder, a plural- A, ity of serrated drlving 'elements vmounted thereon, a wedgemovablerelative to each against the work, a block interposedbetween' each wedge and element and provided with an inclined surface on which. the-element is i operating the first means,` means comprlslng a condult extendingl lowest position on the said inclined surface,

power means for operating the wedges simultaneously and with Aequal pressure, and means for rotating the holder.

21. A work driving device comprising the combination of a base adapted to be secured to the face plate of a lathe, awork-engaging jaw holder mounted thereon, a fluid pressure cylinder also mounted on the base, a workengaging jaw in the holder, and means operated from and in the axial line of the fluid pressure cylinder for operating the jaw.

22.141 work driving device comprising the combination of a base, a work-engaging jaw holder mounted thereon, a fluid pressure cylinder also. mounted on the base, a serrated Work-engaging jaw in the holder, a wedge for operating the jaw, a piston within the cylinder, and a piston rod coaxial of the pis-v ton and operatively connecting the wedge to the piston whereby to operate the jaw.

23. A work drivin-g device comprising the combination of a base, a work-engaging jaw holder mounted thereon, afi-luid pressure cylinder also mounted on the base, a serrated work-engaging jaw in the holder, a wedge for o erating the jaw, a piston within the cylin er, a piston'rod operatively connected to the wedge and adapted to operatel the jaw,

and a spring surrounding the piston rod within the cylinder for operating the piston in one direction, the piston being operated in the op osite direction by `fluid pressure'.

24. work driving device-comprising the combination of a base, a work-engaging jaw holder mounted thereon, a Huid pressure cylinder also mounted on the base, a serrated work-engaging `jaw in the holder, a wedge for operating the jaw, a piston within the cylinder, a piston rod operatively connectedV to the wedge and adapted to operate the jaw, and a 'sprin surrounding the piston rod within the cy inder on one side of the piston for operating they piston in the vwork-releasing direction, the piston being operated in the work-engaging direction by fluid pressure. v

In testimony signature. j

JAMES K, GULLEN,4 

